Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b6d413ee096e78…

MALICIOUS

PDF

46.5 KB Created: 2021-09-10 04:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d17e4052871598663d7c3b1cf8db9104 SHA-1: ced4ca28735d4ed296ba56cc088d37cf2c6aff51 SHA-256: 23b6d413ee096e78450cfc773a9196a180e6dc83236a689c3c4bcc263c419e55
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains numerous embedded URLs, many of which point to other PDF files hosted on various domains, suggesting a link farm or SEO abuse. One URL, http://pr-jam.com/ckfinder/userfiles/files/pisavokuletulos.pdf, is specifically identified as part of a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://pr-jam.com/ckfinder/userfiles/files/pisavokuletulos.pdf In PDF document text
    • http://jtg-antracyt.pl/files/file/38634396246.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/66802216044.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/35240106365.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907062205.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/fibope.pdfIn PDF document text
    • http://oris-am.com/editor_up/nuzigulofatamipupamo.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109011803263306.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/69321251671.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/kaxirebu.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/timejavoke.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/040100218459.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pexukato.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/furejabefek.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/xuralefetoni.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/ferukija.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/laxojazewodijajarapuni.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613751045d65c---jilariderudajof.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/54420125964.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/bapomusajoxudegovavu.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/nutagonepepa.pdfIn PDF document text
    • https://anakmeong.com/contents/files/15895473542.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631121499.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/24540569618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+someone+see+if+you+look+at+their+instagramPDF link annotation